Abst'/> Valorizing waste iron powder in biogas production: Hydrogen sulfide control and process performances
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Valorizing waste iron powder in biogas production: Hydrogen sulfide control and process performances

机译:在沼气生产中平衡废铁粉:硫化氢控制和工艺性能

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AbstractBiogas is composed of different gases including hydrogen sulfide (H2S), which is a hazardous gas that damages pipes and generators in anaerobic digestion system. The objective of this study was to control H2S by waste iron powder produced by laser cutting machine in a steel and iron industry. Waste iron powder was mixed with dairy manure at a concentration between 2.0 and 20.0 g/L in batch experiments, while the concentration was varied between 1.0 and 4.0 g/L in bench experiment. In batch experiment, a reduction of up to 93% of H2S was observed at waste iron powder of 2.0 g/L (T1), while the reduction was of more than 99% at waste iron powder beyond 8.0 g/L (T4 ∼ T6). The total sulfide concentration (ST) increased together with waste iron powder concentration and was fitted with a quadratic equation with a maximum STof 208.0 mg/L at waste iron powder of 20.2 g/L. Waste iron powder did not have significant effect on methane yield in batch and bench experiments. However, hydrolysis rate constant was increased by almost 100%, while the lag-phase period was reduced to half in test digesters compared to that in control digester. In bench experiment, H2S concentration was reduced by 89% at 2.0 g/L, while 50% at 1.0 g/L. Therefore, waste iron powder was effectively removed H2S and did not affect negatively anaerobic digestion process.HighlightsWaste iron powder was used to control hydrogen sulfide in biogas production.In batch experiment, a reduction of 93% of H2S at waste iron powder of 2.0 g/L.Total sulfide concentration in digester increased together with waste iron powder.Waste iron powder did not affect methane yield in batch and continuous experiments.In continuous experiment, H2S was reduced by 50% at waste iron powder of 1.0 g/L.
机译: 摘要 沼气由不同的气体组成,包括硫化氢(H 2 S),这是一种有害气体,会损坏厌氧消化系统中的管道和发电机。这项研究的目的是通过钢铁工业中激光切割机生产的废铁粉控制H 2 S。在分批实验中,废铁粉与奶牛粪便的混合浓度为2.0至20.0 g / L,而在台式实验中,废铁粉的浓度在1.0至4.0 g / L之间变化。在分批实验中,当废铁粉为2.0 g / L(T1)时,H 2 S减少了93%,而减少量为废铁粉超过8.0 g / L(T4〜T6)时,超过99%。总硫化物浓度(S T )随着废铁粉浓度的增加而增加,并拟合了具有最大S T 在废铁粉为20.2 g / L时为208.0 mg / L。在分批实验和台架实验中,废铁粉对甲烷产率没有明显影响。然而,与对照消化池相比,测试消化池的水解速率常数几乎提高了100%,而滞后期却缩短了一半。在实验中,H 2 S的浓度在2.0 g / L时降低了89%,而在1.0 g / L时降低了50%。因此,废铁粉可有效去除H 2 S,并且不会影响厌氧消化过程。 突出显示 使用废铁粉控制沼气生产中的硫化氢。 批量实验,废铁粉为2.0 g / L时,H 2 S减少了93%。 消化池中的总硫化物浓度与废铁粉一起增加。 废铁粉在批量和连续实验中均不会影响甲烷的产率。 在连续实验中,H 2 S减少了50%。

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